Question

why is it possible for you to study the eye colour gene by extracting cheek cells?

o a. because the nucleus of every cell in the human body contains the same genetic information.
o b. because the cheek cells are located near the cells of the eye and so they are able to exchange dna.
o c. because all genes in the human body are expressed at all times so it is easy to study them.
o d. all of the above are possible explanations.

Explanation:

• Option a: In humans, most somatic cells (like cheek cells) have the same genetic information in their nuclei. So, cheek cells can be used to study the eye - colour gene as they contain the relevant DNA.
• Option b: Cheek cells and eye cells do not exchange DNA just because of their proximity. This is a wrong statement.
• Option c: Not all genes in the human body are expressed at all times. Gene expression is regulated, so this is incorrect.
• Option d: Since options b and c are wrong, this option is also wrong.

Answer:

A. Because the nucleus of every cell in the human body contains the same genetic information.